The asymmetric intramolecular Friedel–Crafts type Michael reaction of α,β-unsaturated aldehyde with pyrrole, catalyzed by a spiropyrrolidine (SP)-type organocatalyst, has been accomplished, which allows the construction of a series of azepine and indolizine frameworks with high to excellent enantioselectivities (up to 98% ee). Moreover, the substrate scope could be extended to generate a quaternary center in indolizine frameworks (up to 96% ee).

中文翻译：

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螺吡咯烷有机催化剂催化的不对称分子内Friedel-Crafts反应：吲哚嗪和氮杂骨架的对映选择性结构

螺吡咯烷（SP）型有机催化剂催化的α，β-不饱和醛与吡咯的不对称分子内弗里德-克来福特米歇尔反应得以完成，从而可以构建一系列从高到优的氮杂环庚烷和吲哚嗪骨架对映选择性（高达98％ee）。此外，可以扩大底物的范围以在吲哚嗪框架中生成四元中心（ee高达96％）。